Please try copying and pasting the URL into your browser directly (rather than clicking on it) and it should work fine. To copy and paste the address you will likely need to highlight the text and copy/paste it rather than just right clicking the link and selecting "Copy Hyperlink."
If this is a draft Application or Outcome form you've already worked on before, you can also just go to givinghub.foundationsource.com and sign in there, then go to the Applications or Outcomes area to see your incomplete drafts.
The most likely reason you are receiving this error is that your email program or browser is slightly altering or misinterpreting the link you are clicking on. Often this is purposeful and has to do with spam/virus software. The most common problem is that the ampersand in the link is not being interpreted correctly and is being translated as something else. As mentioned above, try copying and pasting the URL into your browser to visit the address rather than clicking on it and it should work OK.